Telegraph printer



May 4, 1943. c. J. FITCH ETAL 2,313,303

. [TELEGRAPH PRINTER -0riginal Filedfa 24, 1940 e s eets-sneer. 1

FIG. 1a.

' ATTORNEY May 4, 1943. c. J. FITCH ETAL TELEGRAPH PRINTER Qriginl FiledAug. 24, 1940 6 Sheets-Sheet 2 INVENTOR 60 05 J F/nw KURT R S'ffl/VE/DERRN ww TORNEY y 1943- c. J. FITCH arm. 7' 2,318,303

TELEGRAPH PRINTER Original Filed Aug. 24, 1940 a Sheets-Sheet 3''ATTORNEY y 1943- c. J. FITCH ETAL 2,318,303

TELEGRAPH PRINTER ori inal Filed Mg. 24, 1940 6 ShetsQShet 4 ATTORNEY.

INVENTORS May 4, 1943. c. J. FITCH El'AL TELEGRAPH PRINTER OriginalFiled Aug. 24, 1940 Y 6 Sheets-Sheet 5 Patented May 4, 1943 7 2,318,303TELEGRAPH PRINTER Clyde J. Fitch, Endwell, and Kurt R. Schneider,

Endicott, N. Y., assignors to InternationalBusiness MachinesCorporation, New York, corporation of New York OFFICE N. Y., a

()riginal application August 24, 1940, Serial No.

354,035. Divided and this application November 18, 1941, Serial No.419,573

1 Claim. (o1. me-#29) The resent invention relates to printingtelegraphy and more particularly to receiving devices for printingtelegraphy wherein a message is recorded by impressing characters upon atape.

The invention embodies a typewheel, in combination with printing, tapefeeding, and shift mechanism, and novel ribbon feeding and ribbonreversing mechanism and is a divisio of applicants copending applicationSerial No. 354,035, filed August 24, 1940.

An object of the present invention is to provide, in combination with atelegraph receiver of the present type, novel ribbon feeding meansproducing an automatic reversal of the ribbon feed.

Other objects of the invention will be pointed out in the followingdescription and claims and illustrated in the accompanying drawings,which disclose, by way of example, the principle of the invention andthe best mode, which has been contemplated, of applying that principle.

In the drawings: V

Fig. 1 is a front elevation, partly in section, of an embodiment of thepresent invention.

Fig. 1a is a detail view illustrating the operaticn of elements of theshift control mechanism.

Fig. 2 is a plan View of the device of Fig. 1, with the ribbon feedingmechanism omitted.

Fig. 3 is a partial plan view of the device of Fig. 2 illustrating, onan enlarged scale, the two groups of permutation rings comprising theselector mechanism.

Fig. 4 is, a sectional view, on an enlarged scale, taken on the line i iof Fig. 1.

Fig. 5 is a sectional view, on an enlarged scale, taken on the line 55of Fig. 4.

Fig. 6 is an exploded view illustrating the construction of one of theselector clutch mechanisms.

Fig. 7 is a sectional view illustrating details of construction of theclutch mechanism of Fig. 6.

Fig. 8 is an exploded view illustrating the construction of the elementscomprising the shift mechanism.

Fig. 9' is a View similar to Fig. 8, at a different perspective,illustrating the opposite sides of the elements comprising the shiftmechanism.

Fig. 10 is a diagrammatic view illustrating the manner of rotation ofthe typew'heel during shift.

Fig. 11 is a view similar to Fig. 10 illustrating the typewheel in ashifted position.

Fig. 12 is a development of the printing surface of the typewheel.

Fig. 13 is a detail view illustrating the construction of thepermutation ring interlock and release mechanism. V

Fig. 14. is a side elevation illustrating the construction of the ribbonfeed and ribbon reversal mechanism.

Fig. 15 isa view similar to Fig. 14, with parts omitted, illustratingthe gear drive of the ribbon feed mechanism.

Fig. 16 is a view similar to Fig. 15 illustrating the position of a starwheel just prior to ribbon reversal.

Fig. 17 is a view similar to Fig. 16 illustrating the position of thestar wheel just after reversal of the ribbon feed mechanism.

Fig. 18 is a plan View on an enlarged scale illustrating the mounting ofthe ribbon feed and reversal mechanism.

Referring to the drawings, and more particularly to Figs. 1, 2 and 4,the printer mechanism comprises a supporting frame 20 having avertically extending "lug 20a to which is attached a plate 2| by aslotted screw 2|a. Fastened to.

plate 2| by suitable means (not shown) is a casing including athree-section gear box 22 housing the gears 23, 24 and 25. Gears 23 and24 are suspended above and in mesh with gear 25 (Fig. 2) by means ofshafts 23a and 24a to which the gears 23 and 24 are, respectively,attached. Shaft 24a is mounted in ball bearings 24b, 24!) carried by thewalls of the gear box (Fig. 4:) the shaft 24a oarrying'at one endthereof the. gear 240. Shaft 23a, is similarly mounted in ball bearingscarried by its section of the gear box and carries a gear 230 at one endthereof '(Figs. 2 and 3) Gear 25 which, as is'seen from Figs. 2 and 4,meshes with both gears'23 and 24,'is attached to the main 'drive shaft2511 which is mounted in ball bearings 25b, 25b supported in its sectionof the housing, shaft 25a carrying at one end thereof a gear 250 (Fig.4). Fastened to shaft 2511 at the other end thereof, is a pulley 26driven by abelt 21 which in turn is driven by a pulley 28 fastened tothe shaft 29 (Fig. 2) of motor 30.

Gears 23 and 24 are of equal diameter which is'sO chosen with respect tothe diameter of gear 25 as 23A (Fig. 2) carrying a generally cylindricalele-' ment 3| having a helical shaped cam groove 31a formed in the outerperiphery thereof.

In axial alignment with the shaft 24a is a shaft 244 (Figs. 2 and 4)carrying the composite typewheel 32, mounted on shaft 24A for rotationtherewith and axial movement with respect thereto, as will be describedpresently.

In axial alignment with shaft 25a is a shaft 25A carrying the shiftoperating cam 33 (Figs. 1 and 4) print hammer operating cam 34 (Fig. 1)and the ribbon feed and reversal mechanism operating cam 35 (Figs. 1 and4).

Shaft 24A is supported at one end in the ball bearing 36 (Fig. 4) Theother end of shaft 24A terminates in a hollowed out portion 31 intowhich is inserted the shaft portion 3312 (Figs. '4 and 6) of a clutchmechanism 39. Shaft portion 38b is supported by a roller bearing 40(Fig. 4) enclosed in housing 46a (Fig. 2) and is fastened to shaft 24Aby a pin 4| (Fig. 4). Clutch 39 is provided with a dog lift lever 42(Fig. 6) controlled by stop members acting in conjunction with thepermutation rings of theselector mechanism, in a manner to be describedpresently. By-controlgof the dog lift lever 42, the clutch 39 may bestopped in variouschosen rotative positions andia tooth 43*: of theclutch mechanism will thereupon be disconnected from the driving gear240, (similar to 230, Fig. 6) all as described presently. Upon releaseof the dog lift lever 42, as will be presently described, the tooth '43tmoves into engagement with the driving gear 240 (Fig.5) whereby the iclutch 39 will be rotated until lever 42 .is again engaged by apermutation ring controlled stop member thereby positioning the clutch33 and shaft 24A in accordance with the setting of the permutation ringswhich control the lever 42 of that clutch 39 pertaining to-shafti24A.

Clutch 39 pertaining to shaft 24A is an eight position clutch, generallyof'the'type as fully described in the Patent No. 2,206,646 granted toKurt P... Schneider, July 2, 1940, and comprising a cylindrical member38 provided-in'this particular clutch with a series of eightnotch'essuchas 44 (Fig.6) formed in a flange member 3811 integral with member '38.The shaft'portion 33b previously referred to, which is integral withmember 38, extends into the hollowed portions! (Fig. 4) of shaft 24A andis attached thereto, as described above. A pawl member '45 is pivoted at45c and is urged by a spring element 451) (Fig. 7) into engagement withflange member 38a to cooperate with a notch-44 and thus prevent backrotation of the clutch when stopped in any one of its eight rotativepositions.

As is seen from Figs. '6 and '7, the face of member 38 adjacent to itsgear 240 (similar to 230, shown) is provided with a channel 46 in whichis slidably mounted dog member 43 having the tooth 43f mentioned above.A support member 3130, integral with member 38, extends part way intochannel 46 and is provided with a reduced portion 38d axially supportinga cylindrical spring member 41 located in a bored portion 43a formed indog member 43, the spring member 4! constantly urging the member 43 insuch a direction (to the right, in Fig. 6) so as to attempt Y to engagetooth 43f with the teeth of its gear 240, similar to 230 (Fig. 6)

Dog lift lever .42, described above, extends crosswise of dog member 43and has a generally ballshaped end 42a (Fig. 6) fitted into a socketshaped recess 331" formed in the face of block 38 adjacent channel 45. Acenter portion 42b of lever 42 engages the sides of a recess 431' formedcrosswise of dog member 43, this center portion being rounded to providerolling engagement between the sides of recess 431' and the portion 42b.The opposite end of the lever 42 is cut diagonally to form a toothportion 42f projecting beyond the circumference of member 38. A slot 38sis formed in the face of member 38,- generally at right angles tochannel 46 to permit oscillation of lever 42, with respect to 38, aboutthe ball and v socket members 42a and 381', respectively, when "thereof,against the force of spring 4! to compress the same.

The tooth shaped end 42t is held in the position" as illustrated in Fig.5, against the force of spring 41 (Fig. '7) and upon release of itstooth shaped end, lever 42 will permit dog 43 to be moved by spring 41so as to engage tooth 43t and gear 240, as described presently.

When-tooth 4325 is released upon a change in setting of the members-ofthe permutation unit, as described-later, the dog member 43 willengageitstooth 43t with gear 240 and lever-42 and member 33 will-be rotated bymeans ofgear 24c inthe direction as indicated by the dash arrows in-Fig.5. Upon engagement of end 42t and a stop member controlled by theelements ofthe permutation unit, as described presently, the lever willbe relativelymoved, with respect to 38, about. itsball and socketconnection to the position as shown in Fig. 5,thereby disconnectingtooth 43t andgear 240.

Back rotation of element 38 is prevented by imgagement of pawl 45 withone of the eight notches 44 formed in the flange 38a of this particularclutch, thereby stopping the clutch at one of eight predeterminedpositions when the clutch is controlled in the novel manner as presentlyde scribed.

Shaft 23A is supported at one end by a ball bearing similar to bearing36 of shaft 24A and contained in housing 48 (Fig. 2). The other end ofshaft 23A terminates in a hollowed out portion, similar to portion31 ofshaft 24A, into which is inserted a shaft portion 38b of a clutch 39,

similar to that provided for shaft 24A with the clutch is provided(Figs. 5 and 7) with four notches 44 only, to prevent back rotation ofthis clutch member from any one of the four stop positions.

Shaft 25A is similarly supported at one end by a ball bearing 36 (Fig.4) and is provided witha hollowed out portion similar to portion 31 ofshaft 24A, into which projects a shaft portion 38b of a clutch 39associated therewith, and similar to clutch 39 of shaft 24A, with theexception that only one notch 44 is provided in its flange member 33a.to prevent back rotation at one stop position only of shaft 25A, asdescribed presently.

Typewheel positioning Novel means are now provided for positioning atypewheel character carrying element 50 of the composite typewheel 32'.The positioning of typewheel element 50 includes three separateoperations, namely, rotatively positioning the typewheel element,axially positioning the typewheel element and zone positioning of thetypewheel element, which zone positioning comprises the shift function.These three operations will now be described in detail.

Rotative positioning of the typewheel As illustrated in Fig. 2, aplurality of five magnets is provided, each responsive to one element ofa -unit code signal. Three of the magnets 5|, 52 and 53, respectively,are utilized to control permutation ring members which in turn regulatethe rotative positioning of the typewheel, and the remaining two magnets54 and 55 control the axial positioning of the typewheel, all asdescribed presently. A magnet 56 (Figs. 4 and 5) is connected in thereturn line of the other five magnets and is operated upon energizationof any one of these magnets, to produce tape feed, ribbon feed, printingand zone positioning, all as described presently. It is deemed obviousthat magnet 56 may be independently connected for operation by aseparate code signal component, such as the stop component, ifsequential code signal components are utilized.

Referring to Figs. 3, 4 and 5, means entering into a novel combinationwith the respective clutches 39 are disclosed therein. That particu lar'clutch 39 which controls the rotative positioning of shaft 24A andtherefore the rotative positioning of the typewheel 5D is shown assurrounded by a plurality of three permutation selector rings 51, 58 and59, respectively, contained within the casing 60, mounted on the side ofgear box 22. These rings are maintained in position surrounding theclutch 39, by means of casing 65 and eight clutch stops 5|, as shown.Each of the stops 5! is formed as a yoke having a toothed portion Ela,at one end thereof bearing against the outer periphery of the threerings and another portion 6th comprising a laterally extending stopcooperating with the toothed end 4213 of lever 42 when the particularstop is selected Each of these stops is mounted for radial movement andis constantly urged towards the center of the rings and against theouter peripheries of the rings, by means of individual springs 63. Eachof the three permutation rings is held against bodily lateral movementbetween the solid end of casing 58 and the mid-portion of the stops 5|,the rings riding on support 62 (Fig. 4). Each of the rings 5?, 58 and 59may be rotated by means of an arm 64 (Fig. 5) extending outwardly fromcasing 50 and connected to an individual tension spring 55 whichconstantly holds the corresponding ring in one of two rotary positions.Each of the arms 54 is connected by a link 65 to one end of a lever 6!which is pivoted at its other end 63 to a point 59 and connected nearits mid-point to a movable core 10 controlled by the correspondingmagnet; the rings 57, 58 and 59 being thus connected to the magnets 53,52 and 5|, respectively. Upon energization of any one of the magnets 5|,52 or 53, the corresponding ring will be rotated against the pull of itsassociated ring 55 and will assume its second rotary position.

As shown, (Fig. 4) there are three permutation rings encircling thatclutch 33 which controls the shaft 24A and since each ring may beoperated to any one of two positions, a total of eight permutationpositions may be obtained. Each of the three rings is provided with aseries of eight notches, each one respectively of the series of therespective notches being designated as 571;, 5811, and 5911. whichnotches are formed in the outer periphery of the corresponding ring, thenotches on the respective rings being so posi tioned relatively to eachother that a plurality of three notches, and three only, one only oneach of the respective rings, will be aligned for each of the eightpermutation positions of the three rings and such alignment occursdirectly beneath one of the resiliently operated stops 6|. The toothedportion Bla of the particular stop selected, will enter the threerespective aligned notches 5712, 5871 and 59n in the three rings, underthe influence of its spring 53 while all of the remaining stops are heldin their most remote radial position by the outer peripheries of thethree rings. A different stop is, therefore, permitted to move radiallyinward for each of the eight permutation positions of the three rings.

Assuming that this clutch 39 was previously stopped in one position byengagement between a stop element 51 and its lever 42; upon reception ofa different signal permutation which energizes at least one of themagnets 5|, 52 or 53, one of the rings 51, 58 or 59 will be rotated toits second rotative position and the previously rotated rings will bereset to the first rotative position by means of their respectivesprings 65. Upon rotation of any one ring to its second position, adifferent set of notches on the respective rings Will be aligned andanother stop member will be newly set, and the previously set stopmember 6! will be cammed out of its associated group of notches so thatthe lever 42 will be released from the previously set stop memberthereby permitting the dog 43 to move its tooth. 431E into engagementwith gear 25c. The clutch 39 will thereupon be rotated until tooth 42tof lever 42 engages the laterally extending and Sib of the newly'se'tstop member 51 Which has entered the last three aligned notches of therings 57,58 and 55. Upon this engagement of tooth Mt and the chosen stopmember 6!, the dog member 53 is operated against the force of spring ll,its tooth as: is disengaged from the gear 240 and the clutch isthereupon stopped in its new position. One of the eight notches itformed in the flange 38a of this clutch, will be engaged by its pawlunder the urge of spring 551) to thereby prevent back rotation of clutch39. By this rotation of clutch 39-; shaft 24A'and typewheel member willbe rotatively positioned in accordance with the particular relativesetting of the permutation rings 51,58 and 59, or in other Words, inaccordance with the particular permutation of three of the code'signalelements received. In this manner,

any one of ight circumferential positions of the typewheel can beselected. As is seen from the development of the typewheel 50 (Fig. 12),there are sixteen rotative or circumferential positions. Sinc only eightequally spaced circumferential positions are chosen by the threepermutation ring elements 51, 58 and'59, additional means.

must be provided for selecting the intermediate zone positions betweeneach of the chosen eight rotative positions. As is seen from Fig. 12,the

circumferential positions in each ring of characters are dividedalternately into figures and control, respectively, the rotativepositions of the permutation rings TI and 12 in the same manner asmagnets 53, 52 and 5| control, respectively, the rotative positioning ofrings 51, 5B and 59, all asdescribed above. Since each of thepermutation rings H and 72 may be positioned in each of two positions,there is a total of four permutation positions possible for these tworings and one of thefour stop members 51 (Fig. 5), distributed asillustrated in Fig. 5, will be aligned with a set of two notches lin,7211 in the respective rings H and 12, in each of the four permutationposi tions of rings H and '52, so that the particular clutch 38controlled by rings H and 12 and controlling the rotation of shaft 23Awill be stopped in any one of four different rotative positions, in thesame manner as described in detail with respect to shaft 24A which canbe stopped in any one of its eight rotative positions. A plurality offour notches M- (Fig. 7) cooperates with a pawl 45 to prevent backrotation in any one of these four positions.

It is to be particularly noted, that those ones of the magnets 5i to 55,inclusive, which are energized in accordance with a particular receivedcode permutation of signal elements, do not remain energized untilreception of the next character signal but these selected magnets areonly momentarily energized. Consequently, the permutation selector ringsmust be locked in position after the momentary energization of theselected magnets, in order to prevent the springs 65 from returning therings to their initial positions. fhe loo 'ng means must also bereleasable in order to set the rings in accordance with a sequentiallyreceived code signal. Novel means are therefore provided forinterlocking the permutation rings pertaining to the different shaftsand for releasing the selectively set rings when the succeeding codesignals differ.

Referring to Figs. 3, 5 and 13, an interlocking pawl 13 is pivoted at13p and is urged in a clockwise direction by lever 14 pivoted at 14p andbiased into engagement with pawl 13 by means of a spring 13s. Pawl 13 isgenerally. $-shaped and has a tooth 13a at one end which bears on theperipheries of rings 51, 58 and 59 and has a tooth 73b at the other endwhich bears on the peripheries of rings H and I2. Each of the fivepermutation rings has two special notches 131i], 13112, formed in itsouter periphery, in addition to the regular notches previouslydescribed, one of these, special notches 1311!, for example, cooperatingwith a. pawl tooth in the initial or first position of the permutationring and the other l3n2 cooperating with a pawl tooth in the new orsecond position of the ring. The arrows in Fig. 13, indicate thedirection in which the respective members of the two groups of rings arerotated upon energization of the corresponding magnet; for example, ring5'! is shown in its initial or first position and will be pulledclockwise to its second position, while ring 58 has already been pulledto its second position. Notches 131i! and BM are separated by a toothelement [325 which does not extend to the outer circumference of thering so that when any one of the five rings is rotated from its first toits second position, the interlocking pawl 13 will be cammedcounterclockwise to clear the teeth (3t to unlock the rings and tothereby permit those rings whose magnets are not energized to return tothe first position under the control of the respective springs 65 andthose rings pertaining to the magnets which are energized are permittedto remain in or to be moved to the second possition whereuponthe pawlteeth 13a and 131) will drop into position to lock the rings in theirnewly assumed positions.

With a 5-unit code, the following situation may arise. A charactersignal received, may require the positioning of rings 58 and 'II forexample in their second positions and rings 51, 59 and 12 in their firstpositions while a sequentially received character signal may call forring 11 in its second position and all of the other rings in their firstpositions. Under the assumed conditions, none of the rings is to bemoved from its first to its second position by the sequentially receivedsignal. In order to insure release of the rings under the conditionsassumed, the rings are so mounted and operated as to overrun theirfinally assumed second position, when operated by the respectivemagnets. Thus, in the example chosen, although ring ,H is'already in itssecond position, it will, upon reception of the sequential signal, beoscillated past this finally assumed second position, a slight amountand tooth 13b of the pawl will be cammed counterclockwise (Fig. 13) andsince the teeth 1% do not extend to the outer periphery, tooth 130, willno longer hold ring 58 which returns to its initial position under thecontrol of its spring 65 so that all of the rings except ring II willassume their original positions.

It is seen therefore, that upon oscillation of any one of the rings 51,58 or 59, that the previously selected stop 6| will be camnied out ofits cooperating notches, to release lever 42 of the corresponding clutchand will allow the clutch to interconnect shafts 24a and 24A forsimultaneous rotation until lever 62 is again halted by the newlyselected stop. Similarly, oscillation of either one of the rings H or 12will allow shafts 23a and 23A to be connected for rotation to a newposition.

As is seen in Fig. 2, the rotative positioning of the shaft 23A, undercontrol of its four position clutch, rotates the cam member 3! to anyone of four different rotative positions. Upon such rotation, cam slotSla will be rotated so that the sides of the slot can be utilized toproduce movement axially of shaft 23A.

A forked lever 15 (Fig. 2) pivoted at 15p, has a ball-shaped member 15aat one end of the single arm thereof which ball rides in cam groove 3mto thereby rotate the lever 15 in a horizontal plane about pivot 15pupon rotation of shaft '23A. The forked ends 75?) and 750 (Fig. 4) oflever 15 are provided with rollers 151 which engage the sides of acircumferentially extending groove 15 (Fig. 2) formed in a cylindricalmember 11 comprising an element of the composite typewheel 32. Uponrotation of shaft 23A to assume any one of its four rotative positionsunder the control of the permutation rings 1! and 12, the cam slot amwill move the ballshaped member 150., to four different positionsaxially of shaft 23A, to thereby oscillate lever I5 about pivot 15p tomove the arms 15b and'15c laterally whereby the member I! and typewheelelement 56 is moved axially of shaft 25A to four different positions.The construction of the composite typewheel proper 50 will now bedescribed in detail.

Referring to Figs. 2, 4, 8, 9, 10 and 11, the novel composite typewheelis shown as comprising the cylindrical member 11, mentioned above,

the typewheel element proper 50, previously described, typewheel zoneselection operating member I8 and sleeve member 19, all mounted on shaft24A. Sleeve member 19 comprises a 1101- lowed cylindrical portion 19aprovided .with a flange 191) at one end thereof, having a pair ofdiametrically aligned slots 79c extending radially inward from the outerperiphery of the flange. A pair of diametrically opposed, rectangularapertures 19d (Fig. 8) are cut through the wall of the cylindricalmember 79a adjacent the opposite end thereof, from the outer peripheryto the inner bore 19c.

Zone selection operating member 78 is provided with an elongated,generally elliptical opening 18a in the center thereof whereby member 18can be mounted on the cylindrical portion 79a of member '19 for rotationtherewith but at the same time being free to move axially thereof underthe control of zone selecting mechanism to be described later. One faceof member 78 (Fig. 9) is provided with a pair of diametrically opposedprojecting lugs 18b, 18b which fit into and slide against the sides ofslots 790 when member 78 is mounted in position on member 19, asillustrated in Figs. 2 and 4. The opposite face of member '18 isprovided with a pair of diametrically pposed cylindrical lugs 78c, 780(Fig. 8) which project respectively into each of the eccentric slots 50a(Fig. 9) formed in the face of the typewheel element 50 whereby thetypewheel is rotated upon operation of member 78, as describedpresently. A pair of holes 1811, 18d are formed in one side member ofmember 18 which holes coact with a ball member 50b (Fig. 9) in anopening 500 formed in typewheel element 50, said ball member being urgedtoward the holes 78d by means of a helical spring member 5133, tomaintain the member 78 in either one of the positions to which it isoperated, it being noted that the holes 1801 are of smaller diameterthan ball 50b, so that only a portion of the ball enters one of theopenings 78d, and upon movement of member 13, radially of member 18a, asdescribed presently, the ball is disengaged from one hole 18d andsubsequently engaged with the other. 'The typewheel 50, as previouslydescribed, has a plurality of letters and figures formed in the outerperiphery thereof, the sixteen axially extending rows comprisingalternately figures and letters, as illustrated in development in Fig.12, so that, upon rotation of the typewheel element to any one of theeight rotary positions produced by rotation of shaft 24A, as previouslydescribed, either a row of figures or a row of letters is selected andshift is produced by operation of member 18 to rotate the typewheel onesixteenth of a revolution, as described presently. A pair of roundednotches m, 59' are provided on the inner periphery of the typewheelelement 59 which coacts with a spring urged ball element 77c (Figs. 4and 8) to stop the typewheel element in either one of two alternatepositions. The typewheel 50 is provided with an axial bore 50a so thatthis element can be mounted on the cylindrical member 79a, as disclosedin Fig. 4.

Member i1 is provided with a pair of diametrically opposed slots'lla'extending radially from the outer periphery thereof to the innerbore Tlb,

into which is inserted the cylindrical portion 19a of member '19, asshown in Fig. 4, until cylindrical ters and figures. r

helical spring Tis into engagement with one or the other of the openings5011. (Fig. 8) of the typewheel 50, depending upon the'zone position ofthe typewheel produced by the shift function. A rectangular pin 8!)(Fig. 4) is 'inserted'into' one ofthe slots Ha of member Ti andpassesthrough the rectangular apertures 19d of member 1%) and through arectangular slot 248 out axially 'of shaft 24A (Fig. 4), for movementaxially there'- in and into the'other slot 'll'a of member 71, to

connect the members 1'! and T9 to shaft 24A for Zone positioning orshift Novel means are now provided for producing zone positioning orshift of the typewheel. .As described above, in one axial position ofthe typewheel element, zone positioning, operating member 18 is solocated as to be operated axially, to thereby shift the typewheelelement one sixteenth of a revolution, which operationcomprisesthe shiftof the typewheel from letters to figures or vice versa, since, as isseen. in Fig. 12, the axially extending rows of characters arealternately let- Shaft 2 5A is provided with the operating cam member 33adjacent one end thereof (Fig. 4)

which rotates in the same plane, as lever 8! (Fig. 1) having anelongated aperture 81a formed in one end thereof into which projects apin 82 'ccnnected to th frame 25. A spring 8|s is attached at one end tothelever 8| adjacent the lower endof the elongated aperture 85a and isconnected at its other end to a support piecett.

' Lever Si is positioned so as to abut the buttoned (Fig. 4) springpressed by helical spring 85 against one faceof the lever 8|. By meansof th pivot suspension of lever 8| composed of the pin t2 extending intothe elongated slot 8 I a, and by means of the resilient support providedby sprin ftls and the spring pressed button 8d, the lever 8: isprotected against deformation. "If for any reason, the timing betweenthe cam 33 and'the typewheel is not correct and lever 8! is raisedbefore the typewheel assumes its'extreme right hand position (Fig. 4),the resilient support of the lever- 8| will prevent breakage or injuryto e this lever into engagement with zone selection,

operating member 18. and due tothe coaction of lugs 18b-and slots19c'moves the' member 18 j radially of the shaft 24A. Uponjsuchradialmovement, the cylindrical lugs .180 (Fig. 8),. ridingin the eccentricslots'5fio'l(Fig.x9). Will rotate the typewheel one sixteenth of arevolution to thereby shift from letters to figures or vice versa.

As is seen from Figs. 10 and 11, upward motion of member 18. as viewedin Fig.4, will move lugs I80 in slots 59a to rotate the typewheel 50;With member I3 in one downwardly extending position, the lugs 180 willbe moved from the position as shown in Fig. 10 to the position as shownin Fig. 11 and the typewheel will be rotated one sixteenth of arevolution in one direction. Upon 180 rotation of shaft 24A, theopposite operating end of member I8 (Fig; 1a) will now be projectingdownwardly and upon upward movement of member I8 'by lever 8I thetypewheel 50 will be rotated one sixteenth of a revolution in theopposite direction. It is to be particularly noted, that the lettersshift and figures shift positions of shaft 23A are 180 apart so thatupon reception of a letters shift signal, the typewheel is rotated fromfigures to letters in one direction and upon reception of the figuresshift signal, the typewheel is rotated from letters to figures in theopposite direction.

Tape feed and printing A roll of tape 86 (Fig. 4) is mounted within thetape roll support 81 attached by a bolt 81a to the arm 88 (Figs. 1 and2) carried by the frame 20. Tape. 80 unwinds from its roll and passesunder 'and over a plurality of guide rollers 89 and finally underneaththe typewheel 50 and between the feed rollers so that upon rotation ofthe feed rollers, as described presently, the tape 86 is fed past thetypewheel element 50, and the characters of the typewheel, whichareselected by the permutation selector mechanism, will be typed upon tape86 by means of the printing mechanism to be presently described.

The feed rollers each comprises a pair of separate rollers 90a and 90band 9m and 9Ib, respectively. Rollers90a and 90b are rotatively mountedon stationary studs 92. Rollers 90a and 9% are each provided with a gear93 (Figs. 1 and 2) integral therewith and meshing with gears94,respectively, fastened 'to the shaft 95. Shaft 95 is rotatablycarried by a lever 96 (Fig. l) pivoted at 91111 the frame 20. The lever96 is biased'upwardly (Fig. 1) 'bya spring 98 so that rollers 9hr and9Ib are constantly urged towards the rollers 90a and 90b with the tape86 between the respective 'pairs of rollers, as is seen in Fig; 1.'Mounted on the shaft 95 for rotation thereof is the ratchet wheel 99located between the rollers 9Ia and 9Ib (Figs. 1 and 2).

A pawl I00-pivotal1y mounted at IOI on lever 1 E02 engages a tooth ofratchet 99, and upon depression of lever I02, as described presently,pawl I90, which is constantly urgedinto engagement with ratchet wheel 99by means of a spring I00s, will slide over a tooth onthe wheel 99 andengage thenext lower tooth of the ratchet wheel so that upon release ofthe lever I02, pawl I00 will rotate the ratchet wheel 99 an amountproportional to the advancement of one tooth, to

inturn rotate the shaft 95 and gears 94 meshing ancl'described inapplicants copendingapplication Serial No. 400,600, filedJuly l, 1941,and "comprise lever I02, as shown in Fig. 1, which is mounted at one endon pivot I03 passing through frame 20. The other end of lever I02 isconstantly urged upwardly by a spring element I04.

Lever I02 passes through a slotted opening I05 formed in the printhammer housing I09, fastened to frame 20 in any desired manner. Avertically reciprocable hammer member I0"! is mounted within the printhammer housing I09 (Fig. l). and is constantly urged upwardly by meansof a spring I09 pressing against the piston portion It'aa of the hammer'i0l. A slot I011) is formed in the hammer member I0! in alignment withslot I05 and the lever I02passesthrough the slot Ifilb so that upondownward oscillation of lever I92, it will depress the hammer Iil'Iagainst the force of spring I08.

A trigger latch I99, pivotally mounted at I090. is constantly urgedcounterclockwise by spring 5095. As the printing hammer I01 is depressedby lever I02, latch 199 will engage a notch I0'I11. in the printinghammer I01 to hold the hammer in cocked position until the trigger latchI09 is subsequently released.

Mounted on shaft 25A are the several cams 33, 34 and 35 previouslymentioned, cooperating respectively with the levers 8|, I02 and H0, cam35 also cooperating with a cam follower I091) of the trigger latch "I09,as described presently. The lever I I0 'is pivoted at I I I foroscillation in a vertical plane and is pivotally connected to the linkII2 for feeding the type ribbon H3, as will be described presently.

As previously described, the flange member 93a, of that clutch 39 whichcontrols the shaft 25A, is provided with a single notch 44 (Fig. 5) toprevent back rotation of the clutch upon stoppage of this clutch in itssingle position. The tooth shaped end 422? of the dog lift lever 42 ofthis particular clutch 39 (Fig. 5) is engaged and held in the positionas shown in Fig. 5 to maintain the clutch 39 disengaged by means of astop lever II4 pivoted at H5 and connected to link H0 pivotallyconnected at II! to one arm II8 of a bell-crank II9 pivotally mounted atI20. Armature 58a of the magnet 50 which is connected in the return lineof the magnets 5| to 55, inclusive, as previously described, forms theother arm of the bell-crank II9 (Fig. 5) so that upon energization ofany magnet, the magnet 50 is energized to attract its armature 58awhereupon the bell-crank H9 is oscillated clockwise about pivot I20 toraise the link I I6 and lower the free end IIfla of lever IM totherebyrelease the dog lift lever 42, so that tooth 4315 engages the gear 250and clutch 39 is rotated one complete revolution, prior to'which time,the magnet 50 is deenergized and the spring Il is, acting through thelever IIA, link H5 andbell-crank II9, restores the armature 50a, to theposition as shown in Fig. 5.

It is seen, therefore, that shaft 25A is rotated once for 'eachcodepermutation of signal elements received. Upon rotation of shaft 25A, cam34 (Fig. 1) will depress the lever I02 to lower theplunge'r I01 untilthe trigger latch I09, continuously urged counterclockwise by spring[09s engages the notch I0'In to hold the plunger in the cooked position,as described above. As

shaft 25A continues to rotate, the cam 34 will engage the cam followerI092) to release the trigger latchjI09'and the spring I98 willquicklyforce the plunger I 0''! upwardly 'to force the tape 86 andribbon II3into operative relation with the typewheel character selectedby the permutation selector mechanism to'th'ereby' print the selectedcharacter on the'ta'pe'fifi.

Ribbon feed and reversal Novel ribbon feed and ribbon reversal mechanismare provided, as shown and described in applicants copending applicationSerial No.

400,600, filed July 1, 1941, as illustrated generally 'with lever II(Fig. 1) to oscillate it about its pivot III. Link I I2 ispivotallyconnected to lever I I0, so that as cam 35 rotates, it engages lever IIOonce for each revolution of shaft A and raises lever H0 and the attachedlink II2.

Referring to Figs. 1 and 4 and to Figs. 14 to 18, inclusive, link H2 ispivotally connected at one end by pivot I2I to lever III] and at itsother end by pivot I22 to one arm I23 of a bell-crank element I24mounted for rotation about shaft I25 journaled in plates I26 and I21,mounted on the frame 20. A pawl I28 pivoted at I29 tothe bell-crankelement I24 is biased against a ratchet wheel I30 by a spring 528s (Fig.14) attached to the arm l24a of bell-crank I24, at one end, and to pawlI28 at the other. As link I I2 is raised by the action of cam on leverIIO, the pawl I28 will be moved back one tooth on the ratchet wheel I30,attached to shaft I25 for rotation thereof. As the cam 35 releases thelever IIO, spring IIOs will pull downwardly on lever III! andlink II2 sothat pawl I28 will advance the ratchet Wheel I30 an amount proportionalto one tooth movement. A locking pawl I3I pivoted at I32 on plate I20(Figs. 4 and 14) is held in engagement with ratchet wheel I30 by aspring I3I s, so that back rotation of ratchet wheel I30 is prevented.As

the ratchet wheel I30 advances counterclockwise,

it rotates the shaft I25 counterclockwise to thereby rotate gear I33(Fig. 15) in the same direction. Gear I33 meshes with five small piniongears I34 .each loosely mounted on a stud I35, which studs join togetherthe star wheels I36a and I351) loosely mounted on shaft I25.

As gear I33 is rotated counterclockwise, step by step, the pinions I34will be rotated clockwise about their respective studs A lever I31pivoted at I38 on plate I25 carries'a roller I39 interj mediate itsends, engaging the outer periphery of star wheel 136a (Fig. 18). Theother end of lever I3? is constantly urged clockwise by a spring I3Isconnected to lever I3'I at one end and to plate I26 at the other so thatthe roller I39 is constantly held against the outer periphery of thefstar wheel I30a.

.the plate I25 (Fig. 18 and carries at its end a spool I42 on which maybe wound the ribbon I I3. A friction washer I42w is provided between thespool I42 and plate I26 to prevent shaft I4I from turning too freely. Asimilar spool I43 is mounted on a shaft I44 journaled in plates I26 andI2! and attached to this shaft is a gear I45 equal in diameter to thegear I40. A friction washer M310 similar to washer I42w is alsoprovided.

As gear I and spool I42 are rotated counterclockwise as viewed in Fig.14, or clockwise as viewed in Fig. 1, the spool I42 winds up the ribbonH3 and unwinds it from spool I43. When the ribbon is entirely unwoundfrom spool I43,

since the end of the ribbon is fastened to spool I43, spool I42 and gearI40 are held against further rotation endeavored to be produced by meansof pinion I34. Pinion I34, therefore (Fig. 15), walks bodily around gearI40, so that the star wheels are rotated counterclockwise despite theforce exerted by spring I3'Is operating through the lever I31 and rollerI33. As is seen by comparison of Figs. 15 and 16, the star Wheels arerotated counterclockwise, since the spring I3Is is no longer strongenough to prevent rotation of the star wheels, and roller I39 thereuponrides up to the peak of a tooth I390; of the star wheel I36a, directlybehind I361), as shown in Fig. 16, and as the pinion I34 continues towalk around ear I40, the star wheels are rotated until roller I39 passesthe peak or high point of a tooth I39a and due to the generally togglearrangement the star wheels are thereupon snapped counterclockwise tobring a different pinion I34 into engagement with gear I45, while thepreviously engaged pinion I34 is disconnected from the gear I40, as isseen in Fig. 17. As gear I33 is rotated step by step, counterclockwise,by elevation and depression of link II2, pinion I34 in engagement withgear I rotates the gear I45 counterclockwise as viewed in Fig. 14 orclockwise as viewed in Fig. 1, whereby the ribbon is now Wound aroundspool I43 and unwound from spool I42.

Similarly, as described above, if the ribbon should snarl or catch orshould in any manner exert a force so asto prevent rotation of the spoolupon which the ribbon is being wound, an automatic reversal of theribbon feed will ensue. Due to the two simultaneous rotations of thepinions I34, that is, clockwise rotation of these pinions about theirstuds and counterclockwise or bodily rotation thereof about shaft I25,there will be no jamming of the gears during shifting of the gear framewhen one of the pinions I34 is While the operations of the variouselements of the complete mechanism have been given in connection withthe respective individual descriptions, a brief description of theoperation of all elements of the device will now be presented in orderto clarify the novel coaction of the relative parts in producing aunitary result, namely,

' printing .of characters on a tape in response to code signalpermutations received, each permutation being representative of acharacter to be printed or a function to be performed.

Upon reception of the five signal elements comprising a codepermutation, certainof the magnets 5I, 52, 53, 54 and 55 (Fig. 2) willbe energized. Upon energization of any one of the magnets 5|, 52 or 53,the permutation rings 51, 58

and 59 (Fig. 5) will be relatively rotated to align I certain of thenotches 5112 5811 and 59n so that a chosen stop element 6| will bepermitted to enter the aligned notches. As the rings are operated topermit the chosen stop element to enter these aligned notches, the.previously selected stop element is cammed outof its notches by therotation of any one of the rings and the associated clutch 39willthereupon engageand will rotate until the chosen stop elementengages the toothed end 42f of the clutch dog lift lever 42. Shaft 24Ais thereupon rotated .to a position dependent upon the particularpermutation .of signal elements controlling the magnets 52 and 53.

Similarly, magnets 54 and 55 are energized selectively, by the receivedcode signal permutation and permutation rings II and I2 (Fig. 5) will berelatively rotatively positioned, to permit entry of a stop element 6iinto the newly aligned notches H12 and 121i. The associated clutch 39will be thereupon rotated until the newly selected stop is engaged bydog lift lever 42 and shaft23A will be rotatively positioned inaccordance with the particular permutation of code signal elementscontrolling solenoids 54 and 55.

Rotation of shaft 23A oscillates the arm I5 (Fig. 2) to axially move thetypewheel 53 to one of four axial positions .to select one ring ofcharacters.

Rotation of shaft 24A as described above will rotate the typewheelelement 5:) to one rotative position so that the particular characterfrom the selected ring of characters will be selectively positioned withrespect to hammer I01 (Fig. 4) Upon energization of any signal receivingmagnet, the magnet 53 (Figs. 4 and 5) which is in the return circuit ofall the magnets 5i to 55, inclusive, will be energized. The particularclutch 39 controlled by magnet 56 has only one rotative stop position,so that shaft 25A is rotated one complete revolution and one revolutiononly, for each code signal permutation received.

As shaft 25A rotates its one full revolution the cams 33 (Figs. 1 and4), 34 (Fig. 1) and 35 (Figs. 1 and 4) will be rotated.

Since shafts 23A and 24A are rotated at 1200 R. P. M. while the shaft25A is rotated only at 909 R. P. M.; regardless of which stop elementsare selected, the shafts 23A and 24A will be halted by the time shaft25A has completed three quarters of a revolution. 7

If the code signal received is representative-of the shift function, thetypewheel .elementiil will be moved to the right of the position asillustrated in Fig. 4 until it assumes its extreme right hand positionunder control of the rotating shaft 23A, cam slot (Ma and oscillatinglever I5 (Fig. 2). In the extreme right hand position of typewheel 50,the shaft 24A will be rotatively positioned in either one of twopositions separated by 180, dependent upon whether the. figures shiftfunction or the letters shift function is desired. In this extreme righthand position of the typewheel 58, the radially slidable element 18(Figs;

8 and 9) will project off-center downwardly (Fig. 4) and as cam 33rotates, the element 18 is radially actuated by lever al (Fig. 1a) toproduce rotation of the typewheel 50 for one sixteenth of a revolutionto thereby produce shift, this function being performed during the lastquarter revolution of the shaft 25A. In this position of the typewheel,there are no characters PP Site the hammer I01 so that no character isprinted upon tape 86.

When the typewheel fifl'is axially and circumferentially positioned soas to align a character with the printing plunger or hammer I01, therotation of shaft 25A will first rotate the cam 34 (Fig. 1) to depressthe lever I02 about its pivot I03 to in turn depress the hammer Ill!against the force of spring I08 until the latch I09 engages notch IBM inhammer I0! and the latch is maintained in position by mean of the springI095. Also while lever I 02 is being depressed, the pawl I00 slips backone tooth on the ratchet wheel 99 and upon release of lever I02 by thecontinued rotation of cam 34, spring I04 will raise the lever I02 andpawl I08 will advance the ratchet wheel 99 to rotate the rollers Sid andSH), and rollers a and 90b to thereby advance the tape. As the shaft 25Acontinues to rotate, cam 34 engages the cam follower 19b to release thelatch I09 and the hammer ID! will thereupon force the tape 86 and theribbon I I3 against the chosen aligned character of typewheel 5!)(Fig. 1) to print the selected character.

While shaft 25A is rotating, cam 35 will engage the lever H0, to raisethe link H2 (Fig. 14) to therbey rotate one of the spools I42 or I43 to'wind up the ribbon on one spool and to unwind it from the other, asdescribed above. When the ribbon is completely unwound, the ribbon feedreversal mechanism will automatically reverse the direction of windingas previously explained.

Novel ribbon feeding and ribbon reversal mechanism is therefore providedwhich is particularly adapted for use in a printer, as described above.While there has been shown and described and pointed out the fundamentalnovel features of the invention as applied to a single embodiment itwill be understood that various omissions and substitution and changesin the form and details of the device illustrated and in its operationmay be made by those skilled in the art, without departing fromthespirit of the invention. It is the intention, therefore, to be limitedonly asindicated by the scope of the following claim.

What is claimed is: V In a printing telegraph receiver, a typewheel, aribbon, ribbon feeding mechanism for feeding said ribbon past saidtypewheel comprising a pawl, a ratchet wheel controlled by said pawl, a

gear rotated by said ratchet wheel, a star wheel, a plurality of pinionsattached to and supported by said star wheel and meshing with said gearfor rotation thereby, a pair of spools, a gear for each spool, meansbiasing one of said pinions on said star wheel into engagement with oneof said spool gears, and means controlled by stress on .said ribbonforrotating .said star wheel to dis-

